Volume adjustment member for water treatment tank, water treatment tank, and method for adjusting the volume of a water treatment tank

Abstract

To provide a water treatment tank volume adjustment member, a water treatment tank, and a water treatment tank volume adjustment method that can change a volume of a water treatment tank with simple operation.SOLUTION: In order to solve the above problem, there is provided a volume adjusting member to be put into a water treatment tank that stores water to be treated, the volume adjusting member including: a structure with a specific gravity smaller than that of the water to be treated, and a specific gravity adjustment section that adjusts a specific gravity of the structure, and there are provided a water treatment tank and a water treatment tank volume adjustment method using the volume adjusting member. According to the present invention, a volume of the water treatment tank can be changed with simple operation.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0006]

[0001] The present invention relates to a volume adjustment member for a water treatment tank, a water treatment tank, and a method for adjusting the volume of a water treatment tank.

Background Art

[0002] Generally, in wastewater treatment, a plurality of treatment steps are performed, and water treatment tanks suitable for each treatment step are provided in water treatment facilities. Examples of water treatment tanks used in water treatment facilities include various water treatment tanks such as a reaction tank for adding various additives to stored raw water, a coagulation tank for adding a coagulant to stored treated water, and a sedimentation tank for separating solids from treated water. Since the amount of raw water (treated water) to be treated in such water treatment facilities is large, the water treatment tank itself has become large as a single device. In particular, for water treatment tanks that started being used decades ago, there was a significant tendency to increase the size of the water treatment tank in order to achieve a certain treatment level in terms of treatment technology.

[0003] [[ID=·17]] For example, Patent Document 1 describes unitizing a plurality of water treatment tanks related to coagulation sedimentation treatment for the purpose of saving space in a water treatment tank.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described in Patent Document 1, it is known to miniaturize a new water treatment tank in water treatment facilities. However, when updating an existing water treatment tank, there are many problems such as difficulty in securing sufficient construction space and the need to stop the treatment by the water treatment tank for a long period of time.

[0006] In recent years, due to population decline, the amount of sewage and wastewater treated in water treatment tanks has decreased in regional cities and other areas. Consequently, the amount of wastewater flowing into water treatment tanks is on a downward trend. This leads to an increase in the retention time of wastewater in the water treatment tanks, preventing them from performing as intended and making proper operation and management of water treatment systems equipped with water treatment tanks difficult. Therefore, conventionally, when using existing water treatment tanks to cope with a decrease in inflow, the solution was to shut down the entire series of water treatment tanks performing the same treatment. However, in this case, it was necessary to shut down the entire series of water treatment tanks, making it impossible to cope with the decrease in inflow on a tank-by-tank basis. Furthermore, if the volume of each water treatment tank is reduced to cope with the decrease in inflow, large-scale civil engineering work is required, resulting in high construction costs, and there is a problem in that it is not easy to restore the volume of the water treatment tanks to their original level if the inflow rises again.

[0007] The object of the present invention is to provide a volume adjustment member for a water treatment tank, a water treatment tank, and a method for adjusting the volume of a water treatment tank, which can change the volume of the water treatment tank with simple operations. [Means for solving the problem]

[0008] As a result of diligent research into the above-mentioned problems, the inventors of the present invention discovered that the volume of a water treatment tank can be adjusted with simple work by providing a volume adjustment member inside the water treatment tank, and thus completed the present invention. In other words, the present invention relates to the following volume adjustment member for a water treatment tank, a water treatment tank, and a method for adjusting the volume of a water treatment tank.

[0009] The volume adjustment member for a water treatment tank of the present invention, which solves the above problems, is a volume adjustment member that is introduced into a water treatment tank that stores water to be treated, and is characterized by comprising a structure having a specific gravity lower than that of the water to be treated, and a specific gravity adjustment unit that adjusts the specific gravity of the structure. This volume adjustment component for the water treatment tank allows for easy control of the tank's effective volume. This optimizes the residence time of the treated water within the tank, enabling the tank to perform at its optimal level. Furthermore, the volume adjustment member of this water treatment tank has a structure with a specific gravity lower than that of the water to be treated, making it easy to install in the water treatment tank. Also, because the specific gravity of the structure is lower than that of the water to be treated, when the volume adjustment member is placed in the water treatment tank, it does not exceed the load capacity of the water treatment tank's design and does not deform the structure of the water treatment tank. On the other hand, because the specific gravity of the structure is lower than that of the water to be treated, the structure itself does not sink in the water to be treated, making it difficult to place it inside the water treatment tank (in the water to be treated). Therefore, by providing a specific gravity adjustment section to adjust the specific gravity of the structure, it becomes possible to optimally adjust the specific gravity of the entire volume adjustment member so that it can be placed inside the water treatment tank as a volume adjustment member.

[0010] Furthermore, one embodiment of the volume adjustment member for a water treatment tank according to the present invention is characterized by having a fixing portion that is fixed to the structure of the water treatment tank. This feature makes it easy to fix the volume adjustment member to the structure of the water treatment tank using the fixing part. This prevents the volume adjustment member from moving from its designated installation location due to the water flow of the treated water or the like.

[0011] Furthermore, in one embodiment of the volume adjustment member for the water treatment tank of the present invention, the specific gravity adjustment unit is characterized by adjusting the specific gravity of the structure so that the structure does not float in the water to be treated. This feature allows the specific gravity of the structure to be adjusted by the specific gravity adjustment section, preventing the structure from floating in the treated water. This prevents stress from being exerted on the water treatment tank structure due to the buoyancy of the volume adjustment member. As a result, the volume adjustment member can be stably installed in the water treatment tank, and deformation of the water treatment tank structure can be prevented.

[0012] Furthermore, one embodiment of the volume adjustment member for the water treatment tank of the present invention is characterized in that the structure is made of expanded polystyrene. This feature allows for the easy production of volume-adjusting components in shapes suitable for the shape of the water treatment tank, by using easily processable expanded polystyrene to create the structure. Furthermore, by using lightweight expanded polystyrene to create the structure, it becomes possible to easily install the volume-adjusting components in the water treatment tank without requiring large-scale construction work.

[0013] Furthermore, one embodiment of the volume adjustment member for the water treatment tank of the present invention is characterized in that the structure and the specific gravity adjustment part are detachable. This feature allows for easy modification of the volume adjustment component's specific gravity because the specific gravity adjustment unit is detachable. This makes it easy to adapt even when the type of water being treated is changed. Furthermore, by transporting and installing the lightweight structure and the heavier specific gravity adjustment unit separately, the volume adjustment component can be easily installed in the water treatment tank.

[0014] Furthermore, the water treatment tank of the present invention, which solves the above problems, is characterized by comprising the volume adjustment member of the water treatment tank described above. This feature allows for easy control of the effective volume of the water treatment tank using the volume adjustment component described above. This optimizes the residence time of the water to be treated in the water treatment tank, enabling the water treatment tank to perform at its best.

[0015] Furthermore, the present invention provides a method for adjusting the volume of a water treatment tank to solve the above problems, which is a method for adjusting the volume of a water treatment tank that stores water to be treated, and comprises a volume adjustment step of introducing a volume adjustment member into the water treatment tank, wherein the volume adjustment member comprises a structure having a specific gravity lower than that of the water to be treated, and a specific gravity adjustment unit for adjusting the specific gravity of the structure. This method for adjusting the volume of a water treatment tank allows for easy control of its effective volume. This optimizes the residence time of the treated water within the tank, enabling the tank to perform at its optimal level. In addition, this method for adjusting the volume of the water treatment tank has a structure with a specific gravity smaller than that of the water to be treated, enabling easy installation in the water treatment tank. Also, since the specific gravity of the structure is smaller than that of the water to be treated, when the volume adjustment member is put into the water treatment tank, it will not exceed the design load-bearing capacity of the water treatment tank and will not deform the housing of the water treatment tank. On the other hand, because the specific gravity of the structure is smaller than that of the water to be treated, the structure itself does not sink in the water to be treated, making it difficult to put it into the water treatment tank (in the water to be treated). Therefore, by providing a specific gravity adjustment part for adjusting the specific gravity of the structure, it becomes possible to optimally adjust the specific gravity of the entire volume adjustment member so that it can be put into the water treatment tank as a volume adjustment member.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a volume adjustment member for a water treatment tank, a water treatment tank, and a method for adjusting the volume of the water treatment tank that can change the volume of the water treatment tank with a simple operation.

Brief Description of the Drawings

[0017] [Figure 1] It is a plan view showing the structure of a water treatment tank provided with a volume adjustment member in the first embodiment of the present invention. [Figure 2] It is a schematic explanatory view showing the structure of the volume adjustment member in the first embodiment of the present invention. [Figure 3] It is a schematic cross-sectional view showing the shape of the water treatment tank and the volume adjustment member in the first embodiment of the present invention as seen from the A-A plane of FIG. 1. [Figure 4] It is a schematic explanatory view showing another aspect of the volume adjustment member in the first embodiment of the present invention. [Figure 5] It is a plan view showing the structure of a water treatment tank provided with a volume adjustment member in the second embodiment of the present invention.

Modes for Carrying Out the Invention

[0018] The volume adjustment member and volume adjustment method for a water treatment tank of the present invention aim to change the volume of a water treatment tank. Furthermore, the present invention aims to provide a water treatment tank that allows for easy volume changes using the volume adjustment member. The water treatment tank into which the volume adjustment member of the present invention is introduced can be any known water treatment device, regardless of type. For example, it can be a water treatment tank used in organic wastewater treatment facilities such as sewage treatment plants, wastewater treatment plants, food factories, and pharmaceutical factories, inorganic wastewater treatment facilities such as plating factories, and water treatment facilities such as water purification plants. More specifically, examples include sedimentation tanks, settling tanks, aeration tanks, aerobic reaction tanks, anaerobic reaction tanks, oxidation ditch tanks, coagulation tanks, settling tanks, sludge thickening tanks, sludge digestion tanks, storage tanks, disinfection equipment, and other wastewater treatment facilities.

[0019] [First Embodiment] Hereinafter, embodiments of the volume adjustment member for a water treatment tank and the water treatment tank according to the present invention will be described in detail with reference to the drawings. Furthermore, the explanation of the volume adjustment member for the water treatment tank also serves as an explanation of the volume adjustment method for the water treatment tank according to the present invention. The volume adjustment member and structure of the water treatment tank described in the embodiment are merely illustrative examples for illustrating the volume adjustment member and structure of the water treatment tank according to the present invention, and are not limited thereto.

[0020] (Water treatment tank) The water treatment tank 100 in the first embodiment of the present invention is equipped with a water channel through which the water to be treated flows in a certain direction, and is used for performing various treatments on the water to be treated. The water treatment tank 100 in this embodiment may be equipped with devices and mechanisms for performing various treatments on the water to be treated. For example, it may be equipped with diffusers or aerators for blowing fine bubbles into the water to be treated, as in an aeration tank, or with a stirring mechanism for mixing the water to be treated with activated sludge, as in an aerobic reaction tank.

[0021] Figures 1(a) and 1(b) are top-down plan views of the water treatment tank 100 in which the volume adjustment member 30 is installed in this embodiment, and other structures of the water treatment tank 100 are omitted. As shown in Figures 1(a) and 1(b), the water treatment tank 100 in this embodiment consists of a body 10 that forms the water channel 10c, an inlet 11 for introducing the water to be treated into the water treatment tank 100, an outlet 12 for draining the treated water from the water treatment tank 100, and a volume adjustment member 30 for adjusting the volume of the water channel 10c. The body 10 is composed of a surrounding wall 10a and a bottom surface 10b that form the outer shell. Furthermore, while the water treatment tank 100 in the first embodiment is exemplified as having a channel through which the water to be treated flows in one direction, it is not limited to this, and a water treatment tank having an endless channel, such as an oxidation ditch tank, may also be used.

[0022] (Water to be treated) The water to be treated in the water treatment tank of the present invention is not particularly limited, but examples include organic wastewater such as sewage, agricultural village wastewater, livestock wastewater, and industrial wastewater. In particular, the present invention can be suitably used in water treatment tanks that treat sewage, agricultural village wastewater, etc., whose inflow into treatment facilities is decreasing compared to conventional methods due to factors such as population decline and depopulation. Furthermore, the treated water is assumed to be organic wastewater such as agricultural village wastewater, livestock wastewater, and industrial wastewater containing various components. Therefore, the specific gravity of the treated water is not particularly limited. For example, the specific gravity of water, which is 1.0, may be used as a reference value, or the specific gravity of the treated water may be determined from actual measurements. Alternatively, the specific gravity of the treated water may be estimated from the components contained in the treated water.

[0023] (Waterway) As shown in Figure 1, the water channel 10c in this embodiment is a space surrounded by surrounding walls 10a through which the water to be treated flows in a certain direction. In the waterway 10c, treated water such as sewage is introduced through the inlet 11, and the treated water is discharged from the waterway 10c through the outlet 12. The arrangement of the inlet 11 and outlet 12 shown in Figure 1 is an example and is not limited to the arrangement shown in Figure 1. The arrows in Figure 1 indicate the flow direction of the treated water.

[0024] (Volume adjustment member) The volume adjustment member 30 is installed in the waterway 10c to adjust the volume of the waterway 10c. Figure 2 is a schematic diagram illustrating the structure of the volume adjustment member in the first embodiment of the present invention. As shown in Figure 2, the volume adjustment member 30 is composed of a structure 31 corresponding to the main body of the volume adjustment member, a specific gravity adjustment unit 32 for adjusting the specific gravity of the structure 31, and a fixing unit 33 for fixing the volume adjustment member 30 to the building frame 10.

[0025] (structure) Structure 31 corresponds to the main body of volume adjustment member 30. The shape of the structure 31 is not particularly limited. For example, as shown in Figure 1(a), the water treatment tank 100 can be a rectangular parallelepiped, with a rectangular shape when viewed from directly above, to match the shape of the water channel 10c. This allows the volume of the water channel 10c to be changed without obstructing the flow of the water to be treated through the straight water channel 10c.

[0026] Another example of the shape of the structure 31 is that, as shown in Figure 1(b), when the water treatment tank 100 is viewed from directly above, it has a sloping shape such that the cross-sectional area decreases in the direction in which the water to be treated flows. With this, for example, if the water treatment tank 100 is an aeration tank, the area of ​​the water channel 10c near the inlet 11 is increased to improve the reaction efficiency between the introduced water to be treated and oxygen from aeration and stirring, and as the treatment of the water to be treated progresses away from the inlet 11, the area of ​​the water channel 10c is reduced to adjust the residence time of the water to be treated.

[0027] Figures 3(a) and 3(b) are cross-sectional views of the waterway 10c as seen from plane AA in Figures 1(a) and 1(b), and show an example of the shape of the structure 31 (volume adjustment member 30). Here, as an example of the shape of the structure 31, as shown in Figures 3(a) and 3(b), it can be shaped to correspond to the shape of the surrounding wall 10a and bottom surface 10b that form the waterway 10c, or it can be shaped to a desired shape for the waterway 10c after the volume adjustment member 30 is installed. This makes it possible to change the shape of the waterway 10c to a desired shape quickly and at low cost compared to changing the shape of the waterway 10c by carrying out renovation work on the main structure 10.

[0028] Furthermore, by using the volume adjustment member 30 to give the water channel 10c the shape shown in Figure 3(a), the flow of the water to be treated is made smoother, thereby enabling the water treatment tank 100 to perform optimally. Furthermore, by using the volume adjustment member 30 to give the water channel 10c the shape shown in Figure 3(b), a swirling flow can be created in the flow of the water to be treated, thereby enabling optimal agitation of the water to be treated. As a result, the performance of the water treatment tank 100 can be optimally realized.

[0029] The material of the structure 31 can be any material with a specific gravity lower than that of the water to be treated, and the specific material is not particularly limited. As a result, since the specific gravity of the structure 31 is lighter than that of the water to be treated, the overall weight of the volume adjustment member 30 can be reduced. Therefore, the volume adjustment member 30 can be easily installed in the water channel 10c. In addition, because the specific gravity of the structure 31 is lower than that of the water to be treated, when the volume adjustment member 30 is placed in the water treatment tank 100, the load capacity of the water treatment tank 100 will not be exceeded, and the structure 10 of the water treatment tank 100 will not be deformed.

[0030] Furthermore, a specific example of the material for the structure 31 is expanded polystyrene. By manufacturing the structure 31 from expanded polystyrene, which is easy to process, it is possible to easily manufacture a volume adjustment member 30 with a shape suitable for the shape of the water channel 10c in which it will be installed. In addition, by manufacturing the structure 31 from lightweight expanded polystyrene, it becomes possible to install the volume adjustment member 30 in the water channel 10c with simple work without requiring large-scale construction.

[0031] (Specific gravity adjustment section) The specific gravity adjustment unit 32 constitutes a part of the volume adjustment member 30 and adjusts the specific gravity of the structure 31. Specifically, by combining the specific gravity adjustment unit 32 with the structure 31, the specific gravity of the entire volume adjustment member 30 is adjusted. Here, for example, the specific gravity adjustment unit 32 adjusts the specific gravity of the structure 31 so that the structure 31 does not float in the water to be treated. This prevents stress from being applied to the body 10 of the water treatment tank 100 due to the buoyancy of the volume adjustment member 30. In addition, the volume adjustment member 30 can be stably installed inside the water treatment tank 100, and deformation of the body 10 of the water treatment tank 100 can be prevented.

[0032] The shape of the specific gravity adjustment section 32 is not particularly limited. Furthermore, the material of the specific gravity adjustment section 32 can be any material with a specific gravity greater than that of the water being treated, such as metal, metal alloy, ceramics, or glass.

[0033] As shown in Figure 2, the specific gravity adjustment unit 32 may be an integral and inseparable part of the structure 31. The form in which the structure 31 and the specific gravity adjustment unit 32 are integral and inseparable is not particularly limited. For example, as shown in Figure 2, the specific gravity adjustment unit 32 may be embedded inside the structure 31, or the structure 31 and the specific gravity adjustment unit 32 may be joined or fitted together to create a structure that cannot be removed. With this, since the structure 31 and the specific gravity adjustment unit 32 do not separate in the water treatment tank 100, stable work can be performed when installing and retrieving the volume adjustment member 30 in the water treatment tank 100.

[0034] Figure 4 is a schematic diagram illustrating another embodiment of the volume adjustment member in this embodiment. The specific gravity adjustment unit 32 may be detachably attached to the structure 31, as shown in Figure 4(a). In this case, as shown in Figure 4(a), the specific gravity adjustment unit 32 may consist of multiple members, allowing for fine adjustment of the specific gravity by attaching and detaching the unit. According to this, the specific gravity of the volume adjustment member 30 can be easily changed, so even if the type of water to be treated is changed, the specific gravity of the volume adjustment member 30 can be adjusted to match the specific gravity of the water to be treated after the change. In addition, by transporting and installing the lightweight structure 31 and the heavy specific gravity adjustment unit 32 separately, the volume adjustment member 30 can be easily installed in the water treatment tank 100.

[0035] Furthermore, the specific gravity adjustment unit 32 can be attached to any part of the structure 31. For example, as shown in Figure 4(a), the specific gravity adjustment unit 32 may be attached to the lower end of the structure 31. This allows the structure 31 to be stabilized by attaching the specific gravity adjustment unit 32 to the lower end of the structure 31 where the buoyancy is greatest. Furthermore, depending on the processed shape of the structure 31, the specific gravity adjustment unit 32 may be attached to the central part of the structure 31 as shown in Figure 4(b), or it may be divided and attached to multiple locations on the structure 31 as shown in Figure 4(c). This allows the volume adjustment member 30 to be installed more stably in the waterway 10c by providing the specific gravity adjustment unit 32 in an appropriate position depending on the shape of the structure 31.

[0036] (Fixed part) The fixing part 33 constitutes part of the volume adjustment member 30 and is for fixing the structure 31 to the body 10 of the water treatment tank 100. The fixing part 33 prevents the structure 31 from moving from its predetermined installation location due to the flow of water to be treated, etc. The structure of the fixing part 33 can be anything as long as it can fix the structure 31 to the frame 10. For example, the fixing part 33 may be one which directly fixes the structure 31 to the frame 10 with bolts and nuts or the like. Furthermore, it is preferable that the fixing part 33 has a structure that allows the structure 31 to be detachably fixed to the frame 10. This makes it possible to attach and detach the volume adjustment member 30 with simple work without requiring large-scale construction work, thereby reducing the time and labor costs required to change the volume of the water channel 10c, and allowing the volume of the water treatment tank 100 to be changed as needed.

[0037] Alternatively, as shown in Figure 2, the fixing portion 33 may be configured to fix the volume adjustment member 30 to the frame 10 by using a member that can suspend the structure 31 from the surrounding wall 10a. In this case, since there is no need to drill screw holes or perform other processing on the frame 10, the volume adjustment member 30 can be fixed without damaging the frame 10. In addition, the structure 31 can be easily removed from the frame 10. Furthermore, the fixing part 33 may also be used to fix the structure 31 to the bottom surface 10b. This prevents the structure 31 from floating up near the bottom surface 10b where the buoyancy is greatest.

[0038] [Second Embodiment] Figure 5 is a plan view showing the structure of a water treatment tank equipped with a volume adjustment member in a second embodiment of the present invention. As shown in Figure 5, the water treatment tank 200 in the second embodiment of the present invention is not a water channel through which the water to be treated flows in one direction, but rather a storage tank that treats the water by storing it.

[0039] (Water treatment tank) In the second embodiment, the water treatment tank 200 is formed by an outer circular body 20. The body 20 is composed of a surrounding wall 20a and a bottom surface 20b. The water treatment tank 200 also includes a storage section 20c for storing water to be treated, surrounded by the surrounding wall 20a and the bottom surface 20b, and a volume adjustment member 40 for changing the volume of the storage section 20c.

[0040] As shown in Figure 5, the volume adjustment member 40 provided in the water treatment tank 200 in this embodiment is installed along the inner circumference of the surrounding wall 20a relative to the storage section 20c. This allows the volume of the storage section 20c to be changed without changing the shape of the storage section 20c, thus enabling the volume of the storage section 20c to be changed while maintaining the optimal performance of the water treatment tank 200. Furthermore, the volume adjustment member 40 in this embodiment is identical to the volume adjustment member 30 in the first embodiment, except that the shape and arrangement of the structure and specific gravity adjustment part are selected to match the shape of the water treatment tank 200 (circular outer frame 20), so a detailed explanation is omitted. [Industrial applicability]

[0041] The volume adjustment member and volume adjustment method for a water treatment tank of the present invention can be suitably used to change the volume of a water treatment tank. Furthermore, the water treatment tank of the present invention can be suitably used as a water treatment tank with adjustable volume. [Explanation of symbols]

[0042] 10,20 Main body, 10a,20a Surrounding walls, 10b,20b Bottom surface, 10c Water channel, 11 Inlet, 12 Outlet, 20c Storage section, 30,40 Volume adjustment member, 31 Structure, 32 Specific gravity adjustment section, 33 Fixing section, 100,200 Water treatment tank

Claims

1. A volume adjustment member that is introduced into a water treatment tank for storing water to be treated, A structure with a specific gravity lower than the water to be treated, A volume adjustment member for a water treatment tank, characterized by comprising a specific gravity adjustment unit that adjusts the specific gravity of the structure, the specific gravity of which is greater than that of the water to be treated.

2. It has a fixing part that is fixed to the structure of the water treatment tank, The volume adjustment member for a water treatment tank according to claim 1, characterized in that the fixing portion is a member capable of suspending the structure on the surrounding wall of the water treatment tank.

3. The volume adjustment member for a water treatment tank according to claim 1 or 2, characterized in that the specific gravity adjustment unit adjusts the specific gravity of the structure so that the structure does not float in the water to be treated.

4. The volume adjustment member for a water treatment tank according to any one of claims 1 to 3, characterized in that the structure is made of expanded polystyrene.

5. A volume adjustment member for a water treatment tank according to any one of claims 1 to 4, characterized in that the specific gravity adjustment part is detachably attached to the structure.

6. A water treatment tank characterized by comprising a volume adjustment member for a water treatment tank as described in any one of claims 1 to 5.

7. A method for adjusting the volume of a water treatment tank that stores water to be treated, The water treatment tank is provided with a volume adjustment step in which a volume adjustment member is introduced, A method for adjusting the volume of a water treatment tank, characterized in that the volume adjustment member comprises a structure having a specific gravity lower than the water to be treated, and a specific gravity adjustment unit having a specific gravity higher than the water to be treated and adjusting the specific gravity of the structure.

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